Heald control and drive mechanism for double lift dobbies



30, 1970 v nf uwaz 3,517,103

11mm CONTROL AND DRIVE uncnmrs u FOR DOUBLE LIFT 'DOBBIES ,4 Shets-Sheet1 Filed June 27, 1968 June 30,1970 R, 3,517,703 v HEALD cannon AND muvsMEOBANI Sll-FOR DOUBLE um DOBBIES I 4 sheets-s ee 2 Filed June 27, 1968I 15-. 17a "Ir-1321 19 Ill/III/l/l/l/f/ R. scHwAi Z' I 3,517,703

4 Sheets-Sheet 3 June 30, 1970 HEALD CONTROL AND DRIVE MECHANISM FORDOUBLE LIFT DOBBIES Fild June 27, 1968 R. SCHWARZ 3,517,703

HEALD CONTROL AND DRIVE MECHANISM FOR DOUBLE LIFT DOBBIES June 30, 19704 Sheet s'-Sheet 4 Filed June 27, 1968 Fig. 5

United States Patent M US. Cl. 139-68 Claims ABSTRACT OF THE DISCLOSUREIn a double lift dobby having a heald control and drive mechanismcomprising a baulk with attachment hooks, a pivotal connection betweenthe baulk and the attachment hooks permits a rotative swinging movementand also a straight line movement in the plane of the baulk.

This invention relates to a heald control and drive mechanism comprisinga baulk and attachment hooks for dobby machines of the Hattersley type,especially double lift dobbies.

Dob'bies of the Hatersley type have for each heald of the loom a baulkwhich is pivoted at its center to the heald-operated lever and at eachend of the baulk there is an attachment hook, which according to thecontrol setting is carried along by a pusher bar swinging to and fro,which involves the lifting of the heald into the raised position.

Doublelift dobbies are known in which the attachment hooks are in theform of double hooks with a positive hook attaching movement. Thispositive movement makes a faster operation of the machine possible, asthe alternate engagement and disengagement with the one or the otherpusher bar or with a stationary bar is not left to chance, but the timesequence is exactly known and can be controlled.

In operation, the freely movable baulk performs a swinging movementabout the central attachment point of the jacklever, this point alsoperforming a relative movement. According to whether during thealternate pulling movement of associated pusher bars, the one or theother or both ends of the baulk is or are driven, the position of thepivot points of the baulk ends changes with respect to the hooks. In theknown dobbies of the Hattersley type, especially with simple hooks, therelatively great length of the hooks serves to compensate for thesechanges of position.

Also the baulk end slides up and down on the stationary impact bar andon the stop beams, which causes wear due to friction. These changes ofposition are very disadvantageous with double hooks with positivelocking, the position of which with respect to the opposite hooks shouldnot change.

In order to avod these drawbacks, the heald control and drive mechanismaccording to the invention is charterized by the feature that thearticulated connection between the baulk and the attachment hook allowsa rotational swinging movement as well as a straight line movement inthe plane of the baulk.

In such a control and drive mechanism, with a plate connecting thebalance and the attachment hooks, the plate may, for example, have abolt-like hub or projection with a slot extending transversely to theshaft axis and a sliding block arranged movably therein, the slidingblock having a bore in which a bolt of one of the parts to be connectedis swingably arranged while the 3,517,703 Patented June 30, 1970 otherpart to be connected is swingable on the bolt-like hub or projection.

Such arrangement can, for example, be used very advantageously in healdcontrol and drive mechanisms having an attachment hook which isswingable with respect to the baulk and is constructed as a double hook,one hook of the double hook being capable of engaging the swinging,pulling and pushing ar and the other hook engaging the stationary impactor arrester bar.

In the drawing a constructional example of the invention is illustrated.

FIG. 1 is a diagrammatic illustration of the mode of operation of adobby machine of the Hattersley type with double hooks.

FIG. 2 shows in detail the arrangement of the baulk with the double hookin the position in which it is not drawn out.

FIG. 3 shows the same arrangement according to FIG. 2 in the drawn-outposition.

FIG. 4 is a section on the line IVIV in FIG. 2, and

FIG. 5 is a section on the line VV in FIG 2.

The jack lever 2 which through the various connection bars 3 determinesthe position of the heald 4 is pivoted at the center of the baulk 1. Ateach end of the baulk 1 an attachment hook 5 is swingably arranged andaccording to its position comes into engagement with the arrester bar 6or with the pulling and pushing bar 7 which swings to and fro about theaxis 25 as indicated by the arrow A.

The pulling and pushing bar 7 draws a hook which is engaged with itforwards and pushes the end of the baulk back into its initial positionby means of the plate 13. The control device for the attachment hooks isthe perforated pattern card 8 from which the reading needles 9 read offthe pattern and the draw bars 10 which, according to their position,carry the connecting levers 11 with them.

In FIGS 2 and 5 a section of the control and drive mechanism is shown inwhich the parts arranged at the two ends of the baulk are similar andtherefore have the same reference numerals.

The baulk 1 consists of two spaced parallel plates between which thebolt 12 is arranged. The attachment hook 5 is constructed as a doublehook and comes into engagement according to its position with thearrester bar 6 (FIG. 2 below) or with the pulling and pushing bar 7(FIG. 2 at the top).

Between the hook 5 and the baulk is the plate 13 hav ing a hub-likeextension 14 on which the hook 5 is swingably mounted. In the hub orprojection 14 there is a slot 15 extending transversely to the shaftaxis and in line with the bolt 12 of the baulk 1, which slot serves as aguide for the sliding block 16. The block 16 serves as a bearing for thebolt 12 of the baulk 1. In addition, the plate 13 has recesses 17 andautment surfaces 24 which are shaped to receive mating portions on thepulling and pushing bar 7 or the arrester bar 6.

A spring 18 bears on the plate 13 and tends to swing the attachment hookso as to engage with the pulling and pushing bar 7. A bar 19 operatesagainst the force of the spring 18 and is moved to and fro by a cam disc(not shown) on the drive shaft of the dobby.

The transmission of the control impulses derived from the pattern card 8is effected by means of a lever 21 which is swingable on a shaft 20which co-operates with the surface 22 of the hook 5.

Each time the pulling and pushing bar 7 is in the rear dead centerposition (FIG. 3 below), the plate 13- being held between the pullingand pushing bar 7 and the arrester bar 6, the bar 19 presses on the hook5 through the rod 23 and thus swings the hook in a counter clockwisedirection. The hook 5 engages with the arresting rail of the bar 6. If,at the next drawing out movement of the pulling and pushing bar 7, theend of the baulk is to be controlled so as not to be moved, the lever 21tilts in front of the surface 22 and thereby locks the position of thehook 5. As shown in the lower part of FIG. 2 the end of the baulk isheld in engagement with the arrester bar and not moved during thedrawing'out movement of the pulling and pushing bar 7 even when the bar19 is retracted.

If on the other hand the pulling and pushing bar 7 is to take the baulkend with it on its next drawing out movement, as is shown in the upperpart of FIG. 3, the lever 21 remains out of range of engagement with thesurface 22 (as shown in the upper part of FIG. 2). As the bar 19 yields,the spring 1 8 now presses on the hook 5 until the hook engages thepulling and pushing bar 7. Since the plate 13 rests on the pulling andpushing bar 7 and on the hook 5, and also engages behind the arrestingrail of the pulling and pushing bar, the attachment hook is guidedwithout play during the whole of the drawing out movement of the pullingand pushing bar 7. As described, the hook which is not drawn out alsorests without play on the arrester bar 6. These positionings act on theends of the baulk free from play. The control and drive mechanism wouldnot operate it there were only a pivotal connection between theattachment hooks and the ends of the baulk. A comparison between FIGS. 2and 3 shows that both the distances between the attachment hook centersand also their relative position have changed. This is one of thereasons for swingably mounting the hooks 5 on the projection 14 of theplate. In addition, due to the movability of the block 16 in the slot15, the bolt 12 can move away from the center of the hook 5 as isevident from the relative position of the bolt 12 and the correspondinghook 5 in FIG. 3.

What I claim is:

1. In a double lift dobby: a heald control and driv mechanismcomprising; a baulk, a pair of movable pushing-and-pulling bars, a pairof stationary arrester bars, a pair of attachment hooks each mounted toselectively engage with one of said pushing-and-pulling bars and withone of said arrester bars, and means pivotally connecting each of saidattachment hooks to said baulk for both pivotal movement relative tosaid baulk and translational movement in the plane of said baulk; saidlastmentioned means comprising a plate having a hub-like projection onwhich said attachment hooks are pivotally mounted, a guide slot withinsaid hub-like projection and extending transversely to the pivotal axisof said attachment hooks, and a slide block pivotally connected to saidbaulk and slidably positioned in said guide slot.

2. A dobby according to claim 1; wherein said guide slot extendsparallel to a line connecting the pivot points of said attachment hookswhen said baulk is not drawn out and maintains this orientation duringmovement of said baulk.

3. In a double lift dobby: a heald control and drive mechanismcomprising; a baulk, a pair of movable pushing-and-pulling bars, a pairof stationary arrester bars, a pair of attachment hooks each mounted toselectively engage with one of said pushing-and-pulling bars and withone of said arrester bars, means including a plate pivotally connectingeach of said attachment hooks to said baulk for both pivotal movementrelative to said baulk and translational movement in the plane of saidbaulk, said plate having recesses therein shaped to receive without playmating portions of said pushing-andpulling bars and said arrester barswhen said pushingand-pulling bars and said arrester bars are engagedwith said attachment hooks.

4. A dobby according to claim 3; including spring means continuallytending to move said attachment hooks into engagement with said pushing-and-pulling bars.

5. A dobby according to claim 4; including means for moving saidattachment hooks against the force of said spring means into engagementwith said arrester bars, and means for holding and locking saidattachment hooks in engagement with said arrester bars.

References Cited UNITED STATES PATENTS 1,841,923 1/1932 Waters 139742,421,599 6/1947 Cash 139-74 2,705,506 4/ 1955 Staubli 139-71 3,285,29111/1966 Favre 13968 FOREIGN PATENTS 155,357 2/ 1954 Australia. 959,8993/1957 Germany.

12,331 1893 Great Britain. 853,856 11/1960 Great Britain.

JAMES KEECHI, Primary Examiner US. Cl. X.R. 139-41, 74

